Material handling equipment



y 27, 1965 J. F. SHUMAKER 3,

MATERIAL HANDLING EQUIPMENT Filed Feb. 11, 1963 2 Sheets-Sheet 1 INVENTOR. JOHN 5HUMAKE/P July 27, 1965 J. F. SHUMAKER 3,197,050

MATERIAL HANDLING EQUIPMENT Filed Feb. 11, 1963 2 Sheets-Sheet 2 INVEN TOR. JOHN 5HUMA KER MJZDM Attorne United States Patent O 3,197,050 MATERIAL HANDLING EQUIPMENT John F. Shurnaker, Mount Pleasant, Iowa, assignor to Ii. I. Case Company, Racine, Wis a corporation of Wisconsin Filed Feb. 11, 1963, Ser. No. 257,391 12 Claims. (6i. 214-140) The present invention relates to earth moving equipment and particularly to loaders, and an object of the invention is to generally improve the construction and operation of such devices. Such a machine consists generally of a rugged boom or lift arm element pivotally carried on a suitable support, preferably a tractor. The bucket is carried on the boom by a pivotal connection and, in a typical use situation, is shoved into a pile of material by motion of the tractor. The bucket is then swung backwardly or rolled back on the boom toward the tractor with sufficient force to break out the mass of material into which the bucket has been shoved, so as to loosen the material from that which surrounds it. The boom is then swung upwardly to raise the material clear of the ground, and the tractor is driven to some other location. Here the bucket is swung to a dumping position where the contents are discharged, after which the tractor is driven back for another load.

The operation of the loader thus entails digging, breakout, and dumping, all of which require swinging of the bucket in an up-and-down direction about the front end of the boom. As will be apparent, the break-out operation may, and usually does require a very substantial force, particularly if the material is solidly packed or frozen. On the other hand, the dumping operation, at least with the usual form of bucket, requires comparatively little if any force, since the weight of the load tends to swing the bucket in the direction to dump, whereas fairly rapid or prompt motion within the dumping range is desirable, since substantial amounts of time can be saved by rapid operation at this point.

The motions of buckets of this type are commonly effected by fluid motors, and the principal object of the invention is to utilize one or more fluid cylinders in a novel way for causing the break-out and dumping action of the bucket.

Fluid cylinders commonly have pistons with rods which project through one of the end walls of the cylinders. The piston rod in such a cylinder has appreciable area which it subtracts from the effective area of the piston on one side. Therefore, with a given fluid pressure available, the piston will be driven with a much larger force in the direction in which the piston rod is moving out of the cylinder, than it will in the direction in which the piston rod is moving into the cylinder, since the high pressure fluid is working on the largest possible area of the piston. On the contrary, with any available predetermined rate of flow of fluid, the piston will move much faster when it is being actuated in the direction in which the rod is moving into the cylinder, than it will when moving so that the rod is moving out of the cylinder. This is so because the fluid, when the rod is moving into the cylinder, is flowing into a space which is largely taken up by the piston rod. The fluid is therefore flowing into a chamber of limited capacity, and it takes a more rapid movement to accommodate the predetermined rate of flow of fluid than would be necessary for operation in the other direction when the fluid would be flowing into a chamber of larger capacity. The device in constructed in a novel manner so as to match these characteristics of the cylinder with the requirements of the operation of the bucket.

Fluid cylinders of the type contemplated are vulnerable when used in connection with a rough machine such as a ice loader, in that the polished piston rods emerging from the cylinders are exposed to damage from falling rocks and other debris which may occasionally spill over the rear edge of the bucket, and the present arrangement has been so devised that certain mechanical elements present for another purpose are so positioned as to shield these comparatively delicate parts from impacts by any substantially heavy objects which might otherwise cause damage.

Other advantages will be apparent from the following description of preferred embodiments of the invention, and from the annexed drawings in which:

FIGURE 1 is a plan view of a device embodying the invention, mounted on a tractor;

FIG. 2 is a right side elevation of the same with the parts in a different position, and with parts broken away;

FIG. 3 is a similar view of a fragment of FIG. 2, with the parts in still another position;

FIG. 4 is a fragmentary right side elevation of a modified form of the device, with parts broken away;

FIG. 5 is a similar view of the device of FIG. 4, with the parts in a different position;

FlG. 6 is a plan view of the device shown in FIGS. 4 and 5, with parts broken away;

FIG. 7 is a view similar to FIG. 4, of a further modified arrangement;

FIG. 8 is a view similar to FIG. 7 with parts in a different position;

FIG. 9 is a view similar to FIG. 7 of a further modification; and

FIG. 10 is a view similar to FIG. 9 with the parts in a different position.

Similar reference characters have been applied to the same parts throughout the specification and the several views of the drawings which are illustrative only, it being understood that the invention is not to be taken as limited by what is shown and described, or in (fact in any manner except as defined by the claims.

As seen in FIG. 1, the device is mounted on a tractor having a body portion 10, traction wheels 1-2 and 14, and front wheels 16 and 18, it being understood that the t-ractor has many other parts which have no bearing on the present invention and which are therefore omitted in the interests of simplicity.

Tractor 16 has fixed thereon in any suitable manner, an auxiliary or loader frame 20 which absorbs much of the stress reaction from the movement of the bucket and distributes it on the tractor body, thereby saving the latter from excessive or destructive forces. Frame 20 has upwardly directed strut portions 22 and 24 (see also FIG. 2). At their upper extremities, struts 22 and 24 have pivotal connections 26 and 28 on which are pivotally mounted booms or lift arms 30 and 32 connected by a rugged cross member or torque tube 34. The latter connects the two booms and forces them to swing about pivots 26 and 28 substantially as a rigid unit. Since booms 30 and 32 are virtually identical, only boom 32 will be described in detail, it being understood that similar parts and relations are present in and on boom 30.

Boom 32 has a reenforcement or gusset plate 36 carrying a pivot 38 to which is attached a piston rod 40 which extends into a cylinder 42, pivoted to frame 20 .on a pivot 44. Therefore, when pressure fluid is fed into cylinder 42 through conduits 46 and 48, the action of piston rod 40 will swing boom 32. up or down about above-mentioned pivot 28 in well-known manner.

Boom 32 has a pivot 50 engaged with flanges 52 and 54, fixed to the rear wall 56 of a bucket generally designated as 58 and forming therewith a rugged bucket structure. Boom 32 extends between flanges 52 and 54 and is pivoted thereto by means of pivot 50, thereby forming a pivotal connection for bucket 58. A similar construction is used in connection with boom 30, the latter being into a pile of material.

pivoted to flanges 6t) and '62 by means of a pin 64.

Bucket 58 is therefore strongly supported on the outer V or forward extremities of booms and 32, and stabilized thereon by a linkage which will now be described.

Spaced backwardly along boom 32 from pivot 59 is a second pivotal connection 66 to which is pivoted a pair of spaced levers 68 and 70. Levers 68 and 79 are connected at their upper ends by a pivotal connection 72 which also serves to connect the two levers 68 and with a link 74'. Link 74 extends forwardly, in the present instance above and generally in the vertical plane of boom 32,2and is engaged with a pivot 76, on an upper portion of above-mentioned flanges 52 and 54. Therefore, levers 6S. and 70, along with bucket 58 will be forced to partake of similar swinging movement when either is rotated about pivotal connections 66 or 50, respectively.

Levers 68 and 70 provide bearing means for trunnions 78 and 80 which are fixed to a cylinder or fluid motor, generally designated as 82, and thus form a pivotal connection supporting cylinder 82. Cylinder 32 has a piston rod 84 which is connected by means of a pivot 86 with a tongue or stop member 88 constituting an anchorage for piston rod 84 and in this embodiment fixed on boom 32. Piston rod 84 carries a piston 90 which plays back and forth within cylinder 82 in the usual manner when fluid is introduced and withdrawn from cylinder 83 through conduits 92 and 94. A similarcylinder 95 is similarly supported and related to boom 39. For convenience, pivotal connection 50' may be designated. as a first pivotal connection. In like manner, pivotal con ncctions' 66, 80, 72,and 76 may be designated as :second, third, fourth, and fifth pivotal connections, respectively.

It is to be understood that tractor 19 includes the usual or well-known mechanism for supplying and controlling pressure fluid for the several cylinders, but which is not shown since it forms no part of the present invention.

In the full line position of the parts shown in FIG. 2, the tractor would be driven so as to force bucket 58 The tractor would be stopped, and pressure fluid would then be turned into cylinder 82 through conduit 92 from said well-known source to act on the larger area of piston 90. Since piston rod 84 is anchored to lug 88, piston rod fidand piston 98, relatively speaking, could not move. Therefore, cylinder 82 .would be forced in a leftward and upward direction, as seen in FIG. 2, swinging levers 68 and 7b in a counterclockwise direction around pivotal connection 66. This would pull on link 74, and cause corresponding swinging of bucket 58 into the dotted position with link74 resting against stop lug 88. This would be the break out position of bucket '58 and would require a very substantial pull in link 74, and its counterpart 96. In this connection, it will be noted that the. area of piston 90 which is opposite and not encumbered by piston rod 84 is effective in this break-out operation. In other words, where the extreme or greatest practical force is required, the greatest capacity or capability of cylinder 82 is utilized.

In the typical operation of the device, after the breakout operation, fluid would be turned into cylinder 42 so as to swing boom 32 in a counterclockwise direction about pivot 28 thereby raising bucket 58 clear of the pile of material. and carrying that which has just been loosened by the break-out action. Boom 32 would be maintained in a raisedposition wherein aminimum of spillage would take place from bucket 58, while the tractor was driven to a point of disposition. In loading a truck body or the like, boom 32 would be raised to a considerable height, as, indicated in FIG. 3, and when the destination was reached, fluid would be turned into cylinder 8-2 through conduit 94 which would cause cylinder 82.- to move to the dotted position in FIG. ,3, swinging bucket 53 about i pivot 50 into the dotted or dumping position of FIG. 3, thus discharging the contents of bucket 58. a

As will be apparent from a consideration of FIG. the fluid in this instance would work on the opposite side of piston 9t? or would flow into the end of cylinder 82 which is largely occupied by piston rod 84. Since the capacity of cylinder 32 on this side of the piston is limited, it would take a relatively large movement of cylinder 82 to accommodate a given quantity of fluid so that the movement of cylinder 82 in the dumping direction would be quite rapid, as compared to the movement in the other or break-out direction. Since the load in the bucket would usually tend to swing the latter in a dumping direction, no appreciable force would be needed to perform the dumping operation, while the relatively rapid movement would be of advantage in shortening the overall time required for the complete digging cycle.

Suitable provisions are made for exhausting or allowing the escape of fluid fromone end of cylinder 82 while fluid is being forced into the other, but these features are not shown since many such are-well known, and form no part of the present invention.

'It is to be understood of course that substantially identical parts are associated with boom 39.

It is also to be noted that link 74 in all positions of cylinder 82 is located directly over piston rod 84, so that if on occasion, a rock or other object should .accidently fall out of bucket 58, it would be deflected by the relatively rough link '74 before it could strike the polished surface of rod 84. In this way, links 74 and 96 offer substantial protection to the highly finished parts of the hydraulic apparatus.

A consideration of FIGS. 2 and 3 will show that levers 6S and'70 areappreciably longer than the spacing between pivots 50 and 76 on the flanges of bucket 58. As a result, a given angular movement of levers 68 and 70 will cause .a greater angular movement of bucket 58 so that, by virtue of the disclosed arrangement, it is possible to swing bucket 58 through a relatively large angle from break-out position, shown in dotted lines in FIG. 2, to dumping position shown in dotted lines in FIG. 3.

The mounting of cylinder 82 on trunnions provides a more favorable moment arm during the work cycles than other arrangementswould do, and it is to be noted that, in approximately the position shown in dotted lines in FIG. 3 with boom 32 lowered, the bottom wall 97 of .bucket 58 will become substantially vertical, and can serve as a dozer blade.

Turning to FIGS. 4-10, .a boom 98, FIG. 4, carries a pivotal connectionwl0tl about which is swingable a bucket 102. Boom 98, as seen in FIG. 6, has a counterpart 104, the two being connected by means of a rugged cross member 106. Boom .104 is connected ,with bucket 102 by means of a pivotal connection 163. Bucket 162 iscontrolled by a single cylinder 119, carried between levers I12 and 1 14. Levers 112 and 114 are supported on a pivotal connection 116 carried on spaced lugs 1'18 fixed on cross member 106. In the present instance, cylinder has a piston rod 126 pivotally connected to the back wall-122 of bucket 102 on a pivotal connection 124, piston rod .120 being bifurcated, as seen in FIG. 6, and engaging pivot 124, which pivot also engages a lug 126 fixed to wall 122. j

Levers i112 and1 1-4 are connected by means of a pivot 128 with a link 130 which is in turn pivoted on a pivot 132 carnied between lugs 134 fixed to the rear wall 1'36 of bucket 102. a

The action of cylinder 1 10 will be similar to that described in .connectionwith the FIG. 2 embodiment, but the arrangement reduces the number of pivot points and makes for .a more compact linkage, and for lighter duty, a somewhat less costly arrangement can be provided. This arrangement can be further modified to use two dump cylinders which are offset either tothe inside or to the outside of the booms or lift arms, within the contemplation of the invention.

FIG. shows the dumping position of the FIG. 4 embodiment. In the present instance, pivot 124- is arranged on the same center line with pivots 1% and 193.

In FIG. 7, a somewhat similar arrangement is shown, a bucket 138 being controlled by a link 149 pivoted to levers 1 /2 and 144. Bucket 138 is pivoted to booms as 146 on a pivotal connection 148, while a piston rod 1% is pivoted on a pivotal connection 152 to a lug 1'54 fixed to the back wall 1% of bucket 133, in the FIG. 7 position generally forwardly of the center line of pivot 148. This arrangement also permits the use of a single tilt cylinder, while the location of the pivot 152 increases the speed of the roll-back action as compared with the previous arrangements.

FIG. 8 shows this arrangement in the dumping position.

The variation shown in FIG. 9 includes a bucket 1S8 mounted on a pivotal connection 160 on a pair of booms as 162, and controlled by a cylinder 164 operating through levers 166 and 168, and a link 170 in a manner similar to the FIG. 7 embodiment. A piston rod 172, however, is pivoted on a pivot 174 to a lug 1'76 fixed to the back wall 178 of bucket 158, in the breakout position shown in FIG. 9, pivot 174 being approximately directly beneath pivot 160. This arrangement gives a more powerful break-out action than the FIG. 7 arrangement, when incorporating .a cylinder of the same size.

FIG. 10 shows the FIG. 9 arrangement in the dumping position.

The operation of the device should be clear from the foregoing description, but to summarize, the bucket is swung into and out of its various positions by introduction of pressure fluid into the dump cylinder or cylinders and, the piston rods being anchored, the cylinders move, swinging the upwardly directed levers and, through the links 74 and 96, the bucket 58. When the bucket has been shoved into the pile of material, fluid is introduced into the dump cylinders to tilt the bucket for break out and roll back action, and it is to be noted that the headends of the cylinders receive the pressure so that the latter is efiective on the entire area of the pistons and cylinder heads, and not merely on the portion which is not encumbered or covered by the cross section of the piston rods, as in many prior structures.

As the bucket is raised, it is kept in control by con trolling the feeding of fluid to the dump cylinders and, when the load is to be dumped, the fluid is fed to the rod ends of the cylinders where, by reason of the capacity of these rod ends of the cylinders, which is substantially restricted by the displacement of the piston rods, the dumping action is prompt and rapid.

If perchance a piece of rock or other substantial objcct should fall off of the bucket in the direction of the dump cylinders 82 and 95, it would be intercepted and the blow taken on link 74 or 96, thereby saving the highly polished piston rods from damage, which might ultimately cause leakage of the hydraulic fluid,

By reason of the motion multiplying effect of the linkage disclosed, an unusually large angular movement of the bucket is possible, so that in extreme dumping position, the bucket can serve effectively as a dozer blade.

The principle may be used with a single dump cylinder, and minor variations are contemplated for obtaining the desired characteristics of operation to suit various anticipated requirements.

What is claimed as new and desired to be secured by Letters Patent of the United States is:

1. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a piston rod extending through a wall of said cylinder and connected to said anchorage, a j link pivotally connected to'the lever at a point spaced upwardly from the second pivotal connection, a pivot mounted on said bucket at a point spaced from the first pivotal connection on the same side of said boom as said third pivotal connection, said link being pivotally secured to said pivot, and means for supplying pressure fluid to said fluid cylinder. p

2. In a loader of the type having a boom movable up and down and a bucket structure mounted on theboom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a l first-pivotal connection on the boom and connected in supporting relation with the bucket structure, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an

anchorage spaced forwardly of the second pivotal con- I nection, a

third pivotal connection on the lever spaced upwardly from the second pivotal connection, a

fluid cylinder supported on said third pivotal connection, a piston slidable in the cylinder and having a piston rod extending through a, wall of saidcylinder and connected to said anchorage, a link pivotally connected to the leverat a point spaced upwardly from the second pivotal connection, a pivot mounted on said bucket structure at a point spaced upwardly from the first pivotal connection on the same side of said boomas said third pivotal connection, said link being pivotally secured to said pivot, and p means for supplying pressure fluid to said fluid cylinder. 3. In a loader'of the type having a boom movable up and down and a bucket structure mounted on the boom for swinging movement into and out of a dumping posi- :tion, means for effecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket structure a second pivotal connection on the boom spaced backwardly from the first pivotal connection, a lever supported on the second pivotal connection, and, in one position of the boom,'directed upwardly, an anchorage on the boom spaced between the second pivotal connection and the bucket structure, a third pivotal connection on the lever spaced from the second pivotal connection, a fluid cylinder supported on said .third pivotal connection, a piston slidable in the cylinder and having a piston rod extending through a wall of said cylinder and connected to said anchorage, a link pivotally connected to the lever at a point spaced therealong from the second pivotal connection, a pivot mounted on said bucket structure at a point spaced upwardly, in said one position of the boom,

from the first pivotal connection on the same side a of said boom as said-third pivotal connection,

means for supplying pressure fluid to said fluid cylinder, and the spacing between said first pivot andtthe last mentioned point on said bucket structure being less than the spacing of said second pivotal connection from the point of pivotal connection of said link to said lever, whereby a given angular movement of said lever will cause a greater angular movement of said bucket structure.

I 4. In a loader of the type having a boom movable up and down and a bucket structure mounted on the boom for swinging movementinto and out of a dumping position, means for eifecting such swinging including the combination of a t first pivotal connection on the boom and connected in supporting relation with the bucket structure, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, a -lever supported on the second pivotal connection, and, in one position of the boom, directed upwardly, an anchorage spaced forwardly of the second pivotal connection, a f V third pivotal connection on the lever spaced from the second pivotal connection, a fluid cylinder supported on said third pivotal connection, a 4 piston slidable in the cylinder and having a 7 piston rod extending througha wall of said cylinder and connected to said anchorage, a t link pivotally connected to the lever at a point. spaced from the second pivotal-connection, a pivot mounted onsaid bucket structure at a point spaced from the first pivotal connection on the same side of said boom as said third pivotal connection, said link being pivotally secured to said pivot, and means for supplying pressure fluid to said fluidcylinder. 5. In a loader of the type havinga boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting era 7 first pivotal connection on the boom and connected in supporting relation with the bucket, a v

econd pivotalconnection on the boom spaced backwardly from the first pivotal connection, a generally v upwardly directed lever supported on the second pivotal connection, an anchorage on the boomfispaced between the second pivotal connection and the bucket, a a third pivotal connection on the lever spaced upwardly fromthe second pivotal connection, a

fluidcylinder supported on said third pivotal connec- .tion,-a e

piston slidable inthe cylinder and having, a piston rod extending through a wall of said cylinder and connected to said'anchorage, a fourth pivotal connection on said lever at a point spaced upwardly from the second pivotal connection,'a i fifth pivotal connection on said bucket at a point spaced upwardly from the first pivotal connection on the same side of said boom as said third pivotal connection, a V link connecting said fourth and said fifth pivotal connections, and, V 7 means for supplying pressure fluid to said fluid cylinder. 6. In a loaderof the type having a boom movable up ,and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a first pivotalconnection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced backsuch' swingingincludirig the combination anchorage on the boom spaced betweenthe second pivotal connection and the bucket, a third pivotal connection on said spaced levers'spaced upwardly from the second pivotal connection, a fluid cylinder disposed between said spaced levers and supported on said third pivotal connection, a piston slide. le in the cylinder and having a piston rod extending through a wall of said cylinder and connected to said anchorage, a link pivotally connected to the levers at a point spaced upwardly from the second pivotal connection and to the bucket at a point spaced upwardly from the first pivotal connection on the same side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fluid cylinder. 7. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, a pair of spaced 7 upwardly directed levers supported on the second pivotal connection, an anchorage on the boom spaced between the second pivotal connection and the bucket, a third pivotal connection on said spaced levers spaced upwardly from the second pivotal connection, a fluid cylinder disposed between said spaced levers, trunnions on said fluid cylinder-extending substantiaily radially or" said cylinder between the ends thereof, said trunnions being supported on said third pivotal connection, a 7 piston siidabie in the cylinder and having a piston rod extending through a wall of said cylinder and connected to said anchorage, a a link pivotally connected to the levers at a point spaced upwardly from the second pivotal connection andto the bucket at a point spaced upwardly from the first pivotal connection on the same side of said boom as said third pivotal connection, and Q means for supplying pressure fluid to said fluid cylinder. 8. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an anchorage on the bucket, a third pivotal connection on the lever spaced upwardly from the second pivotal connection, a fluid cylinder supported on said third pivotal connection, a piston slidable in the cylinder and having a 1 piston rod extending through a wall of said cylinder and connected to said anchorage, a link pivotally connected to the lever at a point spaced upwardly from the second pivotal connection and to the bucket at a point spaced from the first pivotal connection on the same, side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fiuid cylinder. 9. in a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position and into 9 and out of a rolled-back position, means for elfecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an anchorage on the bucket, in the rolled-back position of the bucket, substantially directly forward of said first pivotal connection, a third pivotal connection on the lever spaced upwardly from the second pivotal connection, a fluid cylinder supported on said third pivotal connection, a piston slidable in the cylinder and having a piston rod extending through a wall of said cylinder and connected to said anchorage, a link pivotally connected to the lever at a point spaced upwardly from the second pivotal connection and to the bucket at a point spaced from the first pivotal connection on the same side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fluid cylinder. 16. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position and into and out of a rolled-back position, means for effecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced back wardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an anchorage on the bucket, in the rolled-back position of the bucket, substantially directly beneath said first pivotal connection, a third pivotal connection on the lever spaced upwardly from the second pivotal connection, a fluid cylinder supported on said third pivotal connection, a piston slidable in the cylinder and having a piston rod extending through a wall of said cylinder and connected to said anchorage, a link pivotally connected to the lever at a point spaced upwardly from the second pivotal connection and to the bucket at a point spaced from the first pivotal connection on the same side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fluid cylinder. 11. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for efiecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a

second pivotal connection on the boom spaced backwardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an anchorage spaced forwardly of the second pivovtal connection, a third pivotal connection on the lever spaced upwardly from the second pivotal connection, a fluid cylinder supported on said upwardly directed lever and having a head end and a rod end, a trunnion on said fluid cylinder spaced from said head end and supported on said third pivotal connection, a piston slidable in the cylinder and having a piston rod extending through said rod end of said cylinder and connected to said anchorage, a link pivotally connected to said lever at a point spaced upwardly from said second pivotal connection and to the bucket at a point spaced upwardly from said first pivotal connection on the same side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fiuid cylinder. 12. In a loader of the type having a boom movable up and down and a bucket mounted on the boom for swinging movement into and out of a dumping position, means for effecting such swinging including the combination of a first pivotal connection on the boom and connected in supporting relation with the bucket, a second pivotal connection on the boom spaced backwardly from the first pivotal connection, an upwardly directed lever supported on the second pivotal connection, an anchorage on the boom spaced forwardly of the second pivotal connection, a third pivo al connection on the lever spaced upwardly from the second pivotal connection, a fluid cylinder supported on said upwardly directed lever and having a head end and a rod end, a trunnion on said fluid cylinder spaced from said head end and supported on said third pivotal connection, a piston slidable in the cylinder and having a piston rod extneding through said rod end of said cylinder and connected to said anchorage, a link pivotally connected to said lever at a point spaced upwardly from said second pivotal connection and to the bucket at a point spaced upwardly from said first pivotal connection on the same side of said boom as said third pivotal connection, and means for supplying pressure fluid to said fluid cylinder.

References Cited by the Examiner UNITED STATES PATENTS 2,745,564 5/56 Billenstein 214-140 2,883,077 4/59 Pilch 214---140 3,096,893 7/63 Biedess 214- HUGO O. SCHULZ, Primary Examiner. 

1. IN A LOADER OF THE TYPE HAVING A BOOM MOVABLE UP AND DOWN AND A BUCKET MOUNTED ON THEW BOOM FOR SWINGING MOVEMENT INTO AND OUT OF A DUMPING POSITION, MEANS FOR EFFECTING SUCH SWINGING INCLUDING THE COMBINATION OF A FIRST PIVOTAL CONNECTION ON THE BOOM AND CONNECTED IN SUPPORTING RELATION WITH THE BUCKET, A SECOND PIVOTAL CONNECTION ON THE BOOM SPACED BACKWARDLY FROM THE FIRST PIVOTAL CONNECTION, AN UPWARDLY DIRECTED LEVER SUPPORTED ON THE SECOND PIVOTAL CONNECTION, AN ANCHORAGE ON SAID BOOM SPACED BETWEEN THE SECOND PIVOTAL CONNECTION AND THE BUCKET, A THIRD PIVOTAL CONNECTION ON THE LEVER SPACED UPWARDLY FROM THE SECOND PIVOTAL CONNECTION, A FLUID CYLINDER SUPPORTED ON SAID THIRD PIVOTAL CONNECTION, A PISTON SLIDABLE IN THE CYLINDER AND HAVING A PISTON ROD EXTENDING THROUGH A WALL OF SAID CYLINDER AND CONNECTED TO SAID ANCHORAGE, A LINK PIVOTALLY CONNECTED TO THE LEVER AT A POINT SPACED UPWARDLY FROM THE SECOND PIVOTAL CONNECTION, A PIVOT MOUNTED ON SAID BUCKET AT A POINT SPACED FROM THE FIRST PIVOTAL CONNECTION ON THE SAME SIDE OF SAID BOOM AS SAID THIRD PIVOTAL CONNECTION, SAID LINK BEING PIVOTALLY SECURED TO SAID PIVOT, AND MEANS FOR SUPPLYING SUPPLYING PRESSURE FLUID TO SAID FLUID CYLINDER. 